I have heard about demerol being used as an
oral medication for a pregnant woman (if I remember correctly). Only in one instance. I may be wrong, though. I, too, have only been given demerol in the hospital for serious arm, neck, and shoulder pain. When I was in labor they gave me Staidol. (A derivative of demerol, I believe)
I'm sure our resident pharmacist could tell us more about this as it is most widely used in the hospital, I believe.